The ratio of Adam's CDs to Justin's CDs was 5:3. When Adam gave 7 CDs to Justin, they each had the same amount. How many CDs did they have altogether?
+237 Adam : Justin = 5:3
5x 3x
5x - 7 = 3x + 7
2x = 14
x = 7
Total CD's = 5x + 3x = 8x
= 8 * 7 = 56
